ABSTRACT

In order to investigate the effects of the oil film between deformed disks on the dynamic torque behavior of hydro-viscous drive (HVD), a mathematical model incorporating film lubrication, asperity contact, translational and rotational motion from a friction system is developed based on four kinds of representative film gap cases. The main analytical solutions including squeeze velocity, angular velocity of the driven disk, hydrodynamic torque and total torque are obtained. Soft-start experimental tests are conducted to verify the feasibility of the theoretical model. The results show that both peak value of total torque and hydrodynamic torque increase with the increase of the divergent angle or the convergent angle. Due to the increase of squeeze velocity, surface asperity contact begins to dominate the dynamic torque behavior in the mixed and boundary lubrication regimes, which inevitably caused the soft-start process to become non-stationary. For all the film gap effects, consideration should be given to both the dynamic torque response and improvement of the soft-start characteristics. Moreover, some key parameters including convergent angle, divergent angle and location of the minimum or maximum initial film thickness have great influence on the dynamic torque behavior. Based on the comparison with experimental results, the performance of the theoretical model is found satisfactory.

摘要

为了研究变形盘之间的油膜对液压驱动器（HVD）的动态转矩行为的影响，基于四个方面，开发了一个包含膜润滑，粗糙接触，平移和旋转运动的数学模型各种代表性的胶片间隙情况。得到了主要的解析解，包括挤压速度，从动盘的角速度，流体动力转矩和总转矩。进行软启动实验测试以验证该理论模型的可行性。结果表明，随着发散角或会聚角的增大，总转矩峰值和流体动力转矩均增大。由于挤压速度的增加，表面粗糙接触开始在混合润滑和边界润滑状态下主导动态转矩行为，这不可避免地导致软启动过程变得不稳定。对于所有膜间隙效应，都应同时考虑动态转矩响应和软启动特性的改善。而且，一些关键参数，包括会聚角，发散角和最小或最大初始薄膜厚度的位置，对动态扭矩行为有很大的影响。根据与实验结果的比较，理论模型的性能令人满意。应同时考虑动态转矩响应和软启动特性的改善。而且，一些关键参数，包括会聚角，发散角和最小或最大初始薄膜厚度的位置，对动态扭矩行为有很大的影响。根据与实验结果的比较，理论模型的性能令人满意。应同时考虑动态转矩响应和软启动特性的改善。而且，一些关键参数，包括会聚角，发散角和最小或最大初始薄膜厚度的位置，对动态扭矩行为有很大的影响。根据与实验结果的比较，理论模型的性能令人满意。